Re: Low tranfere rate from WAN site to PC's.

Palle Jensen <palle.jensen@xxxxxxxxxxxx> hath wroth:

But mayby I/we
should stick to the "inside" of the network. PC <--> AP <--> PC. If
both computers are connected to the AP wit an exellent connection at
54 Mbps, then I would believe that I should be able to yield something
better than ~ 300-400 KB/Sek (~3 Mbps). (As you write later)

Yes, it should be faster. First try it with one computer connected to
the AP via ethernet, the other wireless. If you have:
- a fast computer.
- 100baseT ethernet connection.
- a 54Mbits/sec wireless connection.
then you should get about half the wireless rate or 25Mbits/sec
thruput.

However, if your ethernet connection is 10baseT instead of 100, then
it will be the limiting factor and reduce your speed to either about
8Mbits/sec for full duplex, or 5Mbits/sec full duplex. Again this is
with only one computer via wireless. Since you have two wireless
computers, try each computer, one at a time, over wireless to identify
if either computer is a problem.

Then, try it with both computers via wireless. Under ideal
conditions, you should get about 12Mbits/sec with a 54Mbit/sec
wireless association. The speed is cut in half for each wireless
link.

I have used FileZilla. I have used Firefox. I have used BySoft network
monitor (http://www.bysoft.com/). All with same results.

I prefer to use Iperf 1.7:
http://dast.nlanr.net/projects/Iperf/

For internet testing, I like the Web100 NDT tools such as:
http://nitro.ucsc.edu
For Denmark, I think the closest is in Switzerland:
http://cemp1.switch.ch/network/performance/web100/tcpbw100.html
Be sure to check the result details. Also note that a version of the
NDT server works with IPerf.

My ISP has a FTP test site constructed for speed test purposes. With
cable plugged in I have never ever seen anything else than 220 KB/Sek.
Rock steady and always. But again: I believe all you tell me about
overhead, encryption overhead, Packet loss etc..

You're back to the ISP again. Do NOT do your local benchmarks via the
ISP. Do it between your computers. What you're doing is benchmarking
the ADSL line, and not the speed of the wireless. The wireless should
be MUCH faster than the ADSL and your benchmarks will be limited by
the speed of the ADSL.

Let's take a look at the inside of the network. Why do I get such
lousy performance?

I don't know. The easiest way to tell is to only test one section at
a time. The last time I had a similar performance problem, it was a
miswired ethernet cable *AND* a defective 10/100baseT switch. It's
very difficult to find problems when there are two or more things
broken.

I am sitting 30 ft from the acces point, but are still
offered 54 Mbps with exellent connection. Still I don't get much more
that approximately 3 Mbps. Annoying.

Hmmmm.... At 30 ft, I would NOT expect you to get a 54Mbits/sec
connection. Please double check your connection speed. Most of my
testing shows that with conventional antennas (rubber ducky on the
access point and MiniPCI internal laptop card), I can go to about 15ft
before the connection speed drops to below 54Mbit/sec due to
reflections and increased noise. You probably have a better antenna.

Suggestion: Temporarily configure your wireless access point for a
fixed speed instead of "automatic". That will end the issue of the
connection speed. If you're going to do your testing at 30ft (not
recommended), then I suggest a speed such as 24Mbits/sec OFDM which
faster than 4 times your ADSL speed and should be useful for the two
wireless computer test.

Access point: WRT54GC
Firmware: 1.03.0.
Antenna: Linksys High Gain Antenna HGA7S (7 dBi)

Ref: http://www1.linksys.com/products/product.asp?prid=679&scid=35

Thank you for supplying the links. That makes it much easier for me.

I have no experience with that model router.
Careful. That points to the US web site that reports the latest
firmware is 1.02.8. The Denmark web site at:
| http://www-dk.linksys.com/servlet/Satellite?c=L_Download_C2&childpagename=DK%2FLayout&cid=1136592131727&packedargs=sku%3D1125730904111&pagename=Linksys%2FCommon%2FVisitorWrapper
shows 1.03.0. You have the latest firmware.

Ref: http://www1.linksys.com/products/product.asp?prid=648&scid=38


############################################
PCI Network adapter: WMP54G
Used on Stationary PC
Driver version: 3.0.3.0

Don't use vendors software. Only installed drivers and letting XP
control the wireless.

Ok, That works. I've used a few of these, but with the supplied
drivers. Nothing unusual here.

Ref: http://www1.linksys.com/international/product.asp?coid=6&ipid=232


############################################
PCMCIA Network adapter: 3COM Office Connect
Used on Laptop PC.

REF:
http://www.3com.com/products/en_US/searchbyproduct.jsp?path=download&searchby=sku&search=3CRXJK10075

http://www.3com.com/products/en_US/detail.jsp?tab=features&pathtype=purchase&sku=3CRXJK10075

Driver version: 3.3.0.156
Vendors software installed.

I've noticed that products with Super-G tend to cause problem in
systems that do not support Super-G. It's usually at the access
point, where I have to turn OFF Super-G in order to get things
working. However, in this case, this is the only client radio in your
system that supports Super-G. If there's a setting in the driver that
allows you to turn OFF Super-G, try it.

Laptop PC (Amitech FreeNote 4602). XP Professional.
Staionary PC: Homebuild. XP Home.

Are these reasonably fast machines (PIII/600 or better) that can
support speeds of 25Mbits/sec? Do both computers have a 100baseT-FDX
(full duplex) ethernet port? If the machines are slow, for one reason
or other such as insufficient memory, slow CPU, cheap junk ethernet
card, etc..., then benchmarking may be affected.

I live in the middle of Copenhagen, compacted in large old buildings.
I live on 4'th floor. The nearest network I know of is on 1'st floor.
A guess would be that the network that I see is placed from 50-100 ft
away. But I can't really know. If I browse after networs with my Dell
laptop (with build in wireless), then I see approximately 10 AP. With
my stationary PC I rarely see more the 2.

That's a good indication of the relative sensitivity of each computer.
The more systems you see, the more sensitive the radio. It might also
be the position and location of the radios. Do any of the 10 or 2
access points show a very strong (4-5 bars) signal strength
indication? Are they on the same channel as what you're using?

Anyway, try to seperate the testing so that you're only testing one
wireless link at a time. If there is a problem, it should be obvious.

--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

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